[tip:WIP.sched/core 101/114] arch/ia64/mm/init.c:90:29: error: implicit declaration of function 'rlimit_max'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   6ddb6fab35cf50127c3c4dc9d5e15da4258a86c5
commit: 397fbcb564288fb6d39400ae1d2f3363ba19c501 [101/114] sched/headers, signals: Separate out task_struct::signal and task_struct::sighand types and accessors into <linux/sched/signal.h>
config: ia64-allnoconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 397fbcb564288fb6d39400ae1d2f3363ba19c501
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   arch/ia64/mm/init.c: In function 'ia64_set_rbs_bot':
>> arch/ia64/mm/init.c:90:29: error: implicit declaration of function 'rlimit_max' [-Werror=implicit-function-declaration]
     unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16;
                                ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/rlimit_max +90 arch/ia64/mm/init.c

cde14bbf Jan Beulich    2007-02-05  84  	}
cde14bbf Jan Beulich    2007-02-05  85  }
cde14bbf Jan Beulich    2007-02-05  86  
^1da177e Linus Torvalds 2005-04-16  87  inline void
^1da177e Linus Torvalds 2005-04-16  88  ia64_set_rbs_bot (void)
^1da177e Linus Torvalds 2005-04-16  89  {
02b763b8 Jiri Slaby     2010-01-06 @90  	unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16;
^1da177e Linus Torvalds 2005-04-16  91  
^1da177e Linus Torvalds 2005-04-16  92  	if (stack_size > MAX_USER_STACK_SIZE)
^1da177e Linus Torvalds 2005-04-16  93  		stack_size = MAX_USER_STACK_SIZE;

:::::: The code at line 90 was first introduced by commit
:::::: 02b763b8ccc88d030117851f2b76a119932f109e [IA64] use helpers for rlimits

:::::: TO: Jiri Slaby <jslaby@xxxxxxx>
:::::: CC: Tony Luck <tony.luck@xxxxxxxxx>

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